A PHP Framework is a basic platform that allows us to develop web applications. In other words, it provides structure. By using a PHP Framework, you will end up saving loads of time, stopping the need to produce repetitive code, and you’ll be able to build applications rapidly (RAD). Without a PHP Framework in place, it gets much more difficult to produce applications since you’ll have to repeatedly code a lot of PHP. You’ll also have to execute the connection between your database and whatever application you develop from scratch. Meanwhile, using a PHP Framework makes it easier for you to ensure this connection.
Laravel is a free, open-source PHP web framework, created by Taylor Otwell and intended for the development of web applications following the model–view–controller (MVC) architectural pattern and based on Symfony. Some of the features of Laravel are a modular packaging system with a dedicated dependency manager, different ways for accessing relational databases, utilities that aid in application deployment and maintenance, and its orientation toward syntactic sugar.
Symfony as a PHP framework is well suited for large-scale or complex enterprise level projects. It is a quite stable framework. Symfony 3.1 (the current version) helps developers create scalable websites that are flexible to changing business requirements. Symfony can work with some of the largest open source platforms such as PHPBB, Piwik, and Drupal.
CodeIgniter is loosely based on the popular model–view–controller(MVC) development pattern. While controller classes are a necessary part of development under CodeIgniter, models and views are optional. Codeigniter can be also modified to use Hierarchical Model View Controller which allows developers to maintain modular grouping of Controller, Models and View arranged in a sub-directory format.
CodeIgniter is most often noted for its speed when compared to other PHP frameworks. In a critical take on PHP frameworks in general, PHP creator Rasmus Lerdorf spoke at frOSCon in August 2008, noting that he liked CodeIgniter "because it is faster, lighter and the least like a framework."
Yii is an open source, object-oriented, component-based MVC PHP web application framework. Yii is pronounced as "Yee" or [ji:] and in Chinese it means "simple and evolutionary" and it can be an acronym for "Yes It Is!"